Hydrogen Embrittlement Mechanism in Fatigue of Austenitic Stainless Steels
By Y. Murakami, Toshihiko Kanezaki, Y. Mine, S. Matsuoka. 2008
243 citations recorded by the source corpus.
The basic mechanism of the hydrogen embrittlement (HE) of stainless steels under fatigue loading is revealed as microscopic ductile fracture, resulting from hydrogen concentration at crack tips leading to hydrogen-enhanced slip. Fatigue crack growth rates in the presence of hydrogen are strongly frequency dependent. Nondiffusible hydrogen, at a level of 2 to approximately 3 wppm, is contained in ordinarily heat-treated austenitic stainless steels, but, over the last 40 years, it has been ignored as the cause of HE. However, it has been made clear in this study that, with decreasing loading frequency down to the level of 0.0015 Hz, the nondiffusible hydrogen definitely increases fatigue crack growth rates. If the nondiffusible hydrogen at O-sites of the lattice is reduced to the level of 0.4 wppm by a special heat treatment, then the damaging influence of the loading frequency disappears and fatigue crack growth rates are significantly decreased.
Subfields: Materials Chemistry, Mechanics of Materials, Metals and Alloys
View Paper: https://www.semanticscholar.org/paper/1933203d8adcdfcd6569addb679013dfcd5c92f2
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Citations in the corpus
- The mechanism of hydrogen embrittlement in intercritically annealed medium Mn TRIP steel (2016, unknown): “This result indicates that the H desorption rate peaks of HRAH and CRAH specimens with ~50% gR were generated by H detrapped from both a and gR, and that the peak temperature increases with increasing volume fraction of gR most likely due to both a slow diffusion rate and a high solubility of H in g”
- White structure flaking (WSF) in wind turbine gearbox bearings: Effects of ‘butterflies’ and white etching cracks (WECs) (2012, background): “It is suggested that hydrogen enhances fatigue crack initiation and propagation by localisation of plasticity at fatigue crack tip.(134,136) Vegter and Slycke(33) explain that with hydrogen’s formation enhancement of vacancies, this enhances the dislocation climb controlled damage process,(134) whic”
- Steels for bearings (2012, background): “0015 Hz), in order to permit the hydrogen to diffuse to the tips of the propagating cracks [646].”